Caledonian Audio 6BM8/ECL82 SE 2.5W Classique MKII Assembly Manual page 5

Figure 7 – Main power supply PCB with all dropper resistors installed ................. 1 5
Figure 8 - Main power supply PCB fully populated . .......................................................... 1 6
Figure 9 - Main power supply PCB fully populated - another angle .......................... 1 7
Figure 10 - amplifier PCB showing the socket side ........................................................... 1 8
Figure 11. Valve socket soldered to the amplifier board ................................................ 1 9
Figure 12 - Amp PCB fully populated ...................................................................................... 2 0
Figure 13 - Amp PCB socket side with a valve inserted . .................................................. 2 1
Figure 14 - two amplifier PCB completed together with ECL82 valves inserted
(illustration only) ................................................................................................................... 2 2
Figure 15 - Placement of all components on the mounting bard - bottom view .. 2 3
Figure 16 - the complete system – bottom view . ................................................................ 2 4
Figure 17 - Example of IEC socket installed . ......................................................................... 2 4
Figure 18 Mounting the main transformer ........................................................................... 2 5
Figure 19 - Mounting the audio transformers ..................................................................... 2 6
Figure 20 - example of PCB being mounted on the standoff ......................................... 2 7
Figure 21 - speaker and audio input connectors, and star earth lug ......................... 2 8
Figure 22 - potentiometer and PCB mounted ...................................................................... 2 9
Figure 23 - Wiring Diagram - USA (120VAC) ....................................................................... 3 1
Figure 24 - Wiring Diagram - UK (240VAC) . ......................................................................... 3 2
Figure 25 - Ground safety earth from IEC socket wired to the chassis and secured
by shakeproof washer and insert lock nut .................................................................. 3 3
Figure 26 - Live (brown) and neutral (blue) cables connecting the IEC socket to
the power switch .................................................................................................................... 3 4
Figure 27 - Live (brown) and neutral (blue) cables from the power switch
supplying main power to the power transformer [0V, 240V] ............................ 3 5
Figure 28 - Two cables (brown) connecting power transformer secondary
terminals [0-250V] to the main power supply PCB [AC IN]. The green cable
is the ground level cable connecting the [0V] to the star ground. Note the red
cable carrying B+ voltage from the [B+] terminals on the PCB to the two
amplifier boards. . .................................................................................................................... 3 6
Figure 29 - Completed main power supply board wiring . .............................................. 3 7
Figure 30 – Twisted cables (red and black) connecting power transformer
secondary terminals (6.3V, 0V) to the filament power supply PCB (AC +/-
IN) . ................................................................................................................................................. 3 8
Figure 31 – Two pairs of black and red cables (+V and 0V) feeding the two
amplifier boards. The green cable connecting the [0V] terminal on the
filament power supply PCB and the star ground point. The polarity of the H1
and H2 terminals do not matter. . ..................................................................................... 3 9
Figure 32 - Heater cables coming connected to the [H1] and [H2] terminals on
the amplifier boards. ............................................................................................................. 4 0
Figure 33 - Potentiometer on its IO PCB ................................................................................ 4 2
Figure 34 Connecting the RCA input connectors to the potentiometer IO PCB . ... 4 3
Figure 36 - Connecting the potentiometer IO PCB to the amplifier PCB. In this
example a screen cable is used. Note how only one end of the screen is
soldered to the [Audio In -] terminal ............................................................................. 4 4
Figure 37 - Amplifier Board Wiring . ......................................................................................... 4 7
Figure 38 - connecting the output transformer to speaker terminals ...................... 4 8
Figure 39 - Complete wiring and components assembly . ............................................... 4 9
Figure 40 - Schematics ................................................................................................................... 5 5
6BM8-ECL82-SE-Classique Assembly Manual
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Caledonian Audio 5